nvme: add 'iopolicy' module parameter

While the 'iopolicy' sysfs attribute can be set at runtime, most
storage arrays prefer to use the 'round-robin' iopolicy per default.
We can use udev rules to set this, but is getting rather unwieldy
for rebranded arrays as we would have to update the udev rules
anytime a new array shows up, leading to the same mess we currently
have in multipathd for configuring the RDAC arrays.

Hence this patch adds a module parameter 'iopolicy' to allow the
admin to switch the default, and to do away with the need for a
udev rule here.
Signed-off-by: NHannes Reinecke <hare@suse.de>
Reviewed-by: NSagi Grimberg <sagi@grimberg.me>
Reviewed-by: NDaniel Wagner <dwagner@suse.de>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

drivers/nvme/host/core.c

@@ -2746,9 +2746,7 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
 		return -EINVAL;
 	}
 	subsys->awupf = le16_to_cpu(id->awupf);
-#ifdef CONFIG_NVME_MULTIPATH
-	subsys->iopolicy = NVME_IOPOLICY_NUMA;
-#endif
+	nvme_mpath_default_iopolicy(subsys);
 
 	subsys->dev.class = nvme_subsys_class;
 	subsys->dev.release = nvme_release_subsystem;

drivers/nvme/host/multipath.c

@@ -13,6 +13,42 @@ module_param(multipath, bool, 0444);
 MODULE_PARM_DESC(multipath,
 	"turn on native support for multiple controllers per subsystem");
 
+static const char *nvme_iopolicy_names[] = {
+	[NVME_IOPOLICY_NUMA]	= "numa",
+	[NVME_IOPOLICY_RR]	= "round-robin",
+};
+
+static int iopolicy = NVME_IOPOLICY_NUMA;
+
+static int nvme_set_iopolicy(const char *val, const struct kernel_param *kp)
+{
+	if (!val)
+		return -EINVAL;
+	if (!strncmp(val, "numa", 4))
+		iopolicy = NVME_IOPOLICY_NUMA;
+	else if (!strncmp(val, "round-robin", 11))
+		iopolicy = NVME_IOPOLICY_RR;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static int nvme_get_iopolicy(char *buf, const struct kernel_param *kp)
+{
+	return sprintf(buf, "%s\n", nvme_iopolicy_names[iopolicy]);
+}
+
+module_param_call(iopolicy, nvme_set_iopolicy, nvme_get_iopolicy,
+	&iopolicy, 0644);
+MODULE_PARM_DESC(iopolicy,
+	"Default multipath I/O policy; 'numa' (default) or 'round-robin'");
+
+void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys)
+{
+	subsys->iopolicy = iopolicy;
+}
+
 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
 {
 	struct nvme_ns_head *h;
@@ -706,11 +742,6 @@ void nvme_mpath_stop(struct nvme_ctrl *ctrl)
 	struct device_attribute subsys_attr_##_name =	\
 		__ATTR(_name, _mode, _show, _store)
 
-static const char *nvme_iopolicy_names[] = {
-	[NVME_IOPOLICY_NUMA]	= "numa",
-	[NVME_IOPOLICY_RR]	= "round-robin",
-};
-
 static ssize_t nvme_subsys_iopolicy_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {

drivers/nvme/host/nvme.h

@@ -767,6 +767,7 @@ static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
 void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
 void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
+void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys);
 bool nvme_mpath_set_disk_name(struct nvme_ns *ns, char *disk_name, int *flags);
 void nvme_failover_req(struct request *req);
 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
@@ -864,6 +865,9 @@ static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
 static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
 {
 }
+static inline void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys)
+{
+}
 #endif /* CONFIG_NVME_MULTIPATH */
 
 int nvme_revalidate_zones(struct nvme_ns *ns);